Malicious PDF — malware analysis report

Static analysis result for SHA-256 5626cc62c27e6d74…

MALICIOUS

PDF

53.5 KB Created: 2020-09-11 07:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1c4a027f544f4778b863db4864e4d7bc SHA-1: 3572fc3915cfb5af7dc737a38ff472a801505c98 SHA-256: 5626cc62c27e6d74e6bc4a7f853f4ef25372e859a3a1a1ebf861bd16f39f26f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests an attempt to disguise malicious activity within a larger collection of links. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=little+big+snake In PDF document text
    • http://files.dinkidimainecoons.net/uploads/1/3/0/7/130740442/7077561.pdfIn PDF document text
    • http://files.sophyblakeart.com/uploads/1/3/0/7/130739829/xenadevus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3942/2626/files/nomijapenivekir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/visual_basic_net_for_dummies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5326/8642/files/pharmacy_technician_study_guide_prin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/payment_of_gratuity_act_1972_bare_act.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/3899/0485/files/breastfeeding_who.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f515ca_0437b80e9cae4b78a0ff450058f5c93c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cbdbb6_03383b84d02e46d4a9a9caae8d89c5cd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/dad7b5_d26bc85fc6de49e6befb2f7920eb8b0e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/15cd4d_ea9a488a4f87470a9519e901b6b09f64.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7182f3_08d1d485c3954ee49c2081a0e590dc96.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ed2d23_df5a15febf374b3fb135edc167b0a556.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000094e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94E7 4904 bytes
SHA-256: 9f17a5f8cede68cb8420bd3478324ea671ede0b58d2dd07d957d46229e75c461
font_01_sfnt_off0000a5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B3 10648 bytes
SHA-256: 37db684f0565b4948aa270717dd8df2b830340b571765e91fb205702789c2984

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